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function []=Sfgrayplot(x, y, f, strf, rect, nax, zminmax, colminmax, mesh, colout)
// PURPOSE
// Like fgrayplot but the function fec is used to smooth the
// result assuming that the underlying function is linear on
// a set of triangles built from the grid (here with n1=5, n2=3):
// _____________
// | /| /| /| /|
// |/_|/_|/_|/_|
// | /| /| /| /|
// |/_|/_|/_|/_|
//
// Copyright INRIA
// rewritten by Bruno Pincon (17 april 05) (based of my modifs of Sgrayplot)
[lhs,rhs]=argn()
if rhs == 0 then // demo
deff("[z]=Surf(x,y)","z=x.^3+y");
f=gcf();
f.color_map = jetcolormap(64);
f.immediate_drawing = "off";
colorbar(-2,2);
Sfgrayplot(-1:0.1:1,-1:0.1:1,Surf,strf="031",rect=[-1,-1,1,1]);
xtitle("$\Large f(x,y)=x^3+y$");
f.immediate_drawing = "on";
return
elseif rhs < 3 then
error(msprintf(gettext("%s: Wrong number of input arguments: %d to %d expected.\n"), "Sfgrayplot", 3, 10));
end
// some checks
if ~(type(x)==1 & isreal(x)) then
error(msprintf(gettext("%s: Input argument #%d must be real.\n"), "Sfgrayplot", 1))
end
if ~(type(y)==1 & isreal(y)) then
error(msprintf(gettext("%s: Input argument #%d must be real.\n"), "Sfgrayplot", 2))
end
if type(f)~=11 & type(f)~=13 then
error(msprintf(gettext("%s: Wrong type for input argument #%d: function expected.\n"), "Sfgrayplot", 3));
end
p = length(x); q = length(y);
// parsing the optional args
opt_arg_list = ["strf", "rect","nax","zminmax", "colminmax", "mesh", "colout"];
opt_arg_seq = [];
for opt_arg = opt_arg_list
if exists(opt_arg,"local") then
opt_arg_seq = opt_arg_seq +","+ opt_arg + "=" + opt_arg;
end
end
// build the data for fec
z = feval(x,y,f);
[noe_x,noe_y] = ndgrid(x,y)
nbtri = 2*(p-1)*(q-1)
num = (1:p*(q-1))'; num(p*(1:q-1)) = []; num1 = num+1
connect =[(1:nbtri)' , [num num1 num+p;...
num1 num1+p num+p] , zeros(nbtri,1)]
// then plot
if opt_arg_seq == [] then
fec(noe_x,noe_y,connect,z);
else
execstr("fec(noe_x,noe_y,connect,z"+opt_arg_seq+")");
end
endfunction
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